Equalizing brush-holder.



No. 728,596. PATENTED MAY 19, 1908. E. J. MURPHY.

EQUALIZING BRUSH'HOLDER. APPLICATION FILED 0014, 1901.

H0 MODEL.

Fig.2.

Wifinssas. Inventor. Z/VM Edwin Jmurphy.

UNITED STATES Patented May 19, 1903.

PATENT OFFICE.

EDWIN J. MURPHY, OF LYNN, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

EQUALIZI NG BRUSH-HOLDER.

SPECIFICATION forming part of Letters lPatent No. 728,596, dated May 19, 1903.

7 Application filed October 4,1901. Serial No. 77,621. (No model.) I

To all whom, it may 0077106772.

Be it known that I, EDWIN J. MURPHY, a citizen of the United States, residing at Lynn, county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Equalizing Brush-Holders, of which the following is a specification.

My present invention relates to certain improvements in means for supporting brushes bearing upon a commutator or other device, and although of more especial value in connection with electric meters is nevertheless capable of useful employment in other relations.

The features of novelty of the invention are set forth in the claims appended hereto, the invention itself being described in detail in the following specification, which is to be taken in connection with the accompanying drawings, in which Figure 1 represents my invention as applied to an electric meter; and Fig. 2, a View, on an enlarged scale, of the brush-holding arrangement shown in Fig. 1.

The main object of the invention is to equalize the pressure of brushes bearing on a commutator, thereby relieving the shaft carrying the commutator of side pressure, which in a meter is obviously objectionable. To this end the brushes which bear upon the commutator are fixedly secured to a support which is capable of turning through a slight angle.

In Fig.1 a side view of the arrangement is presented, the part 1 representing one of the brushes and 2 the commutator upon which it bears. This brush, together with its companion, which bears on the other side of the commutator, is secured to a block 3 of insulating material, this block being pivoted between two opposing pivots 4 5, carried by a depending bracket 6, secured to the meterframe 7.

Fig. 2 represents the brush-holder upon an enlarged scale, and shows the two brushes fixed to the supporting-block 3, which block is provided with bearings 4 on opposite sides for engaging the. pivots i and 5. The brushes being of spring material are adjusted so that each bears upon the commutator 2. If any inequality exists in the pressure of the brush, the brush pressing with the greater force will then act to produce a slight rotation of the support 3 until the pressure becomes equal.

What I claim as new, and desire to secure by Letters Patent of the United States, is-

1. In an electric meter, the combination of 3. The combination of a commutator,

brushes bearing thereon, and a support for said brushes arranged to have free movement in a plane passing lengthwise through both brushes.

4.. The combination of a commutator, brushes bearing thereon, and a support for said brushes pivoted so that normally it is freely movableabout-an axis laterally displaced fronithe axis of said commutator.

5. The combination of a commutator, a pair of contact-brushes carried by a common support and insulated from each other, and means for permitting movement of said support so as to equalize the pressure of said brushes against said commutator.

6. The combination of a commutator, brushes having one end of each bearing on said commutator and the other ends arranged in fixed relation to each other, and means for supporting the brushes so as to permit automatic equalization of the pressure of said brushes against said commutator.

In witness whereof I have hereunto set my hand this 2d day of October, 1901.

EDWIN J. MURPHY.

Witnesses:

DUGALD McK. MoKILLoP, JOHN J. WALKER. 

